Very nice work there! I've always liked the Choctaw (and its variants). I had a chance to see one fairly close up in Houston, as it landed in a parking lot downtown (it was hauling stuff around to various skyscraper rooftops for an event called the Power of Houston, where they set off fireworks). That is one big bird! You could fit a couple of the little Loaches the HPD used into one of those. It looked like the pilot was about 20 feet off the ground when landed.